Modelling and Characterization of Pmma-Film Coated Impedance Probe Dipped in Adulterated Milk (original) (raw)

Abstract

Impedance characterization and electrical equivalent circuit for the electrode-electrolyte interface of a capacitive type probe dipped in adulterated milk is presented. The electrodes of the probe are coated with porous film of poly-methyl-methaccrelate (PMMA) where the diffusion of ions of the test solution through the porous surface is the mode of sensing. In such measurement, it is very important to know the penetration depth of the ion into the porous surface. The vital question is whether the ions reach the metal electrode surface which may contaminate the solution under test and also degrade the sensor characteristics. In this study, the electrical equivalent circuit has been obtained by complex nonlinear least square (CNLS) curve fitting of experimentally obtained impedance data. Then the parameters of the electrical equivalent circuit along with the other experimental data are used to find the penetration depth of the ions through the porous surface of the coating film. It h...

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